In the field of magnetic therapy, I have personally reviewed some literature and conducted a few human experiments. The experiments involved the use of powerful magnets with magnetic field strengths tens, hundreds, or even thousands of times stronger than the Earth's magnetic field. These magnets were not randomly placed or attached all over the body but were specifically applied to certain acupuncture points. The size of the magnet, the strength of the magnetic field, and the acupuncture points used varied depending on the issue being treated. For certain "ailments," the effectiveness is notable and can certainly be confirmed as not being a placebo effect. Rather than saying that magnetic needles can numb pain, it would be more accurate to say that they can alleviate the cause of the pain (if the correct acupuncture points are targeted and the root cause is properly addressed). If one were to forcibly "numb" the pain to the point of insensitivity, wouldn't the pain simply recur once the magnet is removed? But in reality, this is not the case. The effect of magnetic needles is similar to traditional acupuncture but is non-invasive, making it worthy of further research.

The statement "placing human tissue in the magnetic field produced by an MRI machine will not affect the tissue" is too arbitrary. The magnetic field produced by an MRI machine is just one specific form of a magnetic field; how can one conclude that any magnetic field has no effect on the human body based on this? Whether something is useful or not depends on how it is used. Is inserting a needle into the body useful? The World Health Organization now acknowledges its usefulness, but if done haphazardly, it is not only ineffective but can also have adverse effects. Magnetic fields come in various forms and strengths, and their effects on the human body—whether harmful, harmless, or beneficial—depend on the form and strength of the magnetic field, as well as the part of the body it acts on, the duration of exposure, and the type of disease.

Shen Yaozi said, "The sun bakes the earth, dissipating all things."